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21. Dental hygienists

Projected increase in 2020: 37.7 percentNumber employed in 2010: 181,800Median pay in 2010: $68,250 Education/training: Dental hygienists must get a state license to practice. A degree from dental hygiene school is also usually required. Job outlook: The demand for dental services will grow because of population growth, older people increasingly retaining more teeth, and a growing emphasis on preventative dental care.